x265

x265 is a free software library and application for encoding video streams into the H.265/MPEG-H HEVC compression format, and is released under the terms of the GNU GPL.

Features Overview

Provides next-generation compression and codec.
Fast and excellent quality.
Completly free and libre software, ensuring freedom for everyone.
The APIs are similar to x264 APIs

Getting x265

Source

The latest x265 source code can always be found by anonymous git repository:

# git clone https://bitbucket.org/multicoreware/x265_git.git

You can browse the source on-line.

Encoder features

Full prediction and transform quad-tree recursion supported
Adaptive B-frame placement
B-frames as references / arbitrary frame order
CABAC entropy coding
Intra: all block types (32x32, 16x16, 8x8, 4x4, and PCM with all predictions)
Inter P: all partitions (from 64x64 down to 8x4)
Inter B: partitions from 64x64 down to 8x4 (including all merge modes
and biprediction)
Weighted prediction for P slices
Multiple reference frames
Ratecontrol: constant quantizer, constant quality, single pass ABR, optional VBV
Scenecut detection
Parallel encoding on multiple CPUs, both frame-level and wavefront parallelism

Support

For support information and to ask questions, you have the following possibilities:

A mailing list (x265-devel), and IRC (#x265@freenode and #x265dev@freenode).

Bugs

Please report any bugs to the mailing list. If it is a crash, then compile x265 with `./configure --enable-debug` and follow the ffmpeg bugreporting guidelines.

Licensing

In addition to being free to use under the GNU GPL, x265 is also available under a commercial license from MulticoreWare Inc.

Software using x265

If you use x265 in another project, let us know!